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Browse Prior Art Database

Four Position Coincident Voltage Magnetic Device

IP.com Disclosure Number: IPCOM000098489D
Original Publication Date: 1960-Nov-01
Included in the Prior Art Database: 2005-Mar-07
Document File: 2 page(s) / 34K

Publishing Venue

IBM

Related People

Matick, RE: AUTHOR

Abstract

The magnetic element 10 employs material having a substantially rectangular hysteresis characteristic and a high dielectric constant. It provides a four-position coincident voltage device.

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Four Position Coincident Voltage Magnetic Device

The magnetic element 10 employs material having a substantially rectangular hysteresis characteristic and a high dielectric constant. It provides a four-position coincident voltage device.

A voltage applied between terminals 12 and 14 establishes an electric field in a radial direction between two electrodes 12A and 14A. A potential applied between terminals 16 and 18 establishes an electric field in the element in the Z direction between an electrode 16A and a fourth electrode on the bottom face of element 10 (not shown). The field Ez produces a magnetic field H in the theta direction such that vector (H theta) = (jwr/2) * vector Dz, where vector Dz is displacement in the z direction. The electrodes 12A and 14A are positioned sufficiently close together so that the vector bar Dr is independent of r and a potential between these electrodes provides vector (H theta) = -jwz * vector Dr where vector Dr is displacement in the radial direction.

The origin of the coordinate system is the geometric center of 10. The field H produced by a potential across electrodes 12A and 14A is as shown in a segment 20 of element 10, where the length of the vectors represents the magnitude of H theta. Thus, by proper choice of the amplitude and frequency content of voltages applied to the two pairs of electrodes, a coincident selection of any one of four states is achieved. The different states are as indicated by the different pairs of...